sd 0:0:1:0: [sg0] tag#7994 CDB[00]: e5 f4 32 73 2f 4e 09 6d 26 e2 c7 35 d1 35 12 1c sd 0:0:1:0: [sg0] tag#7994 CDB[10]: 92 1b da 40 b8 58 5b a8 d4 7d 34 f3 90 4c f1 2d sd 0:0:1:0: [sg0] tag#7994 CDB[20]: ba cgroup: fork rejected by pids controller in /system.slice/ssh.service rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=51113, q=98075) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294991289-4294980787), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.5 R running task 28760 27073 26326 0x00000000 Call Trace: sched_show_task.cold+0x332/0x396 kernel/sched/core.c:5337 print_other_cpu_stall kernel/rcu/tree.c:1430 [inline] check_cpu_stall kernel/rcu/tree.c:1557 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0xb37/0xe19 kernel/rcu/tree.c:2682 update_process_times+0x2a/0x70 kernel/time/timer.c:1650 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1465 [inline] __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1527 hrtimer_interrupt+0x326/0x9e0 kernel/time/hrtimer.c:1585 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:__sanitizer_cov_trace_pc+0x22/0x50 kernel/kcov.c:101 Code: 90 90 90 90 90 90 90 90 48 8b 34 24 65 48 8b 04 25 c0 df 01 00 65 8b 15 cc 59 9f 7e 81 e2 00 01 1f 00 75 2b 8b 90 60 13 00 00 <83> fa 02 75 20 48 8b 88 68 13 00 00 8b 80 64 13 00 00 48 8b 11 48 RSP: 0018:ffff8880253778f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff88802535e640 RBX: 0000000000000131 RCX: ffffffff818198f4 RDX: 0000000000000000 RSI: ffffffff81818faf RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000001 R09: 00000000000001fe R10: 0000000000000004 R11: 0000000000000000 R12: ffffea00028dce00 R13: ffffea000287e700 R14: 00000000000001fe R15: dffffc0000000000 __read_once_size include/linux/compiler.h:263 [inline] is_huge_zero_page include/linux/huge_mm.h:231 [inline] release_pages+0xdf/0x15a0 mm/swap.c:740 tlb_flush_mmu_free mm/memory.c:261 [inline] tlb_flush_mmu+0x1dc/0x4f0 mm/memory.c:270 arch_tlb_finish_mmu mm/memory.c:285 [inline] tlb_finish_mmu+0x108/0x200 mm/memory.c:444 exit_mmap+0x2d9/0x530 mm/mmap.c:3095 __mmput kernel/fork.c:1016 [inline] mmput+0x14e/0x4a0 kernel/fork.c:1037 copy_process.part.0+0x57e4/0x8260 kernel/fork.c:2119 copy_process kernel/fork.c:1710 [inline] _do_fork+0x22f/0xf30 kernel/fork.c:2219 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f2b190c8e99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2b17a1d168 EFLAGS: 00000246 ORIG_RAX: 0000000000000039 RAX: ffffffffffffffda RBX: 00007f2b191dc030 RCX: 00007f2b190c8e99 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f2b19122ff1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc96df82af R14: 00007f2b17a1d300 R15: 0000000000022000 rcu: rcu_preempt kthread starved for 10502 jiffies! g51113 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29208 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x4cf/0xfe0 kernel/time/timer.c:1818 rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 48 8b 34 24 mov (%rsp),%rsi c: 65 48 8b 04 25 c0 df mov %gs:0x1dfc0,%rax 13: 01 00 15: 65 8b 15 cc 59 9f 7e mov %gs:0x7e9f59cc(%rip),%edx # 0x7e9f59e8 1c: 81 e2 00 01 1f 00 and $0x1f0100,%edx 22: 75 2b jne 0x4f 24: 8b 90 60 13 00 00 mov 0x1360(%rax),%edx * 2a: 83 fa 02 cmp $0x2,%edx <-- trapping instruction 2d: 75 20 jne 0x4f 2f: 48 8b 88 68 13 00 00 mov 0x1368(%rax),%rcx 36: 8b 80 64 13 00 00 mov 0x1364(%rax),%eax 3c: 48 8b 11 mov (%rcx),%rdx 3f: 48 rex.W